"I'm not gonna be your worthless punching bag Deku forever... Kacchan. I'm... I'm the Deku who always does his best!"

Izuku is a caring person, and will never hesitate to rescue someone in danger, even if he knows that he is not strong enough to do it. Often, he does this on a whim, taking a more careless approach than the usual overthinking he goes through. Izuku has also shown to be selfless enough to try to help people with personal, emotional problems, even if it does not concern him, claiming that a Hero is someone that meddles in the lives of other people.

Otaku Trivia:

1) "Deku" (デク) is another reading of his name Izuku (出久). Written with different kanji, it can mean a wooden figure or puppet, used as an insult for someone who can't do or achieve anything.